FIB recommendations Precast prestressed hollow core floors

AAD VAN PAASSENVBI RESEARCH & DEVELOPMENT

IPHA ANNUAL CONFERENCESeptember 2003

FIB

The International Federation for Structural Concrete (fib- fédération internationale du béton) is a non-profitorganisation created in 1998 from the merger of the Euro-International Concrete Committee (CEB - ComitéEuro-International du Béton) and the International Federation for Prestressing (FIP - Fédération Internationale de la Précontrainte).

FIB Recommendations Precast prestressed hollow core floors

IPHA ANNUAL CONFERENCESeptember 2003

FIB

The objectives of fib as given in the statutes are to develop, at an international level, the study of scientificand practical matters, with the purpose of advancing thetechnical, economic, aesthetic and environmentalperformance of concrete construction.

FIB Recommendations Precast prestressed hollow core floors

IPHA ANNUAL CONFERENCESeptember 2003

FIB

These objectives will be achieved by:

- the stimulation of research, - the synthesis of findings from research and practice, - the dissemination of the results by way of publications,guidance documents and the organisation ofinternational congresses and symposia,

- the production of recommendations for the design andconstruction of concrete structures,

- the information of members on the latest developments.

FIB Recommendations Precast prestressed hollow core floors

IPHA ANNUAL CONFERENCESeptember 2003

FIB Recommendations Precast prestressed hollow core floors

Organisational structure

IPHA ANNUAL CONFERENCESeptember 2003

FIB Recommendations Precast prestressed hollow core floors

FIB CommissionsC 1 StructuresC 2 Safety and performance conceptsC 3 Environmental aspects of design and constructionC 4 Modelling of structural behaviour and designC 5 Structural service life aspectsC 6 Prefabrication

T 6.1 Prestressed hollow core floorsT 6.2 ConnectionsT 6.4 Precast bridgesT 6.5 Precast concrete railway track systems

C 7 Seismic designC 8 ConcreteC 9 Reinforcing and prestressing materials and systemsC 10 Construction

IPHA ANNUAL CONFERENCESeptember 2003

FIB Recommendations Precast prestressed hollow core floors

FIB CommissionC 6 Prefabrication

T 6.1 Prestressed hollow core floorsChairman: Aad van Paassen

Former publications:- Precast prestressed hollow core floors

Recommendation - Quality assurance of hollow core slab floors- Special design considerations for precast prestressed

hollow core floors: Guide to good practice

IPHA ANNUAL CONFERENCESeptember 2003

FIB Recommendations Precast prestressed hollow core floors

FIB Commission T 6.1 Prestressed hollow core floorsAad van Paassen (Chairman) The Netherlands

Arnold Van Acker BelgiumBruno Della Bella ItalyKim Elliott United KingdomGunnar Rise SwedenSpyros Tsoukantas GreeceSébastien Bernardi FranceMassimo Ferrari ItalyNordy Robbens BelgiumAndrzej Cholewicki PolandBjörn Engström SwedenArto Suikka FinlandFritz Mönnig GermanyJosef Hegger Germany Yoshihiro Murayama JapanBarry Crisp AustraliaSubbaiya Kanappan India IPHA ANNUAL CONFERENCE

September 2003

FIB Recommendations Precast prestressed hollow core floors

FIB Commission T 6.1 Prestressed hollow core floors

Update of FIB recommendations

Precast prestressed hollow core floors

IPHA ANNUAL CONFERENCESeptember 2003

FIB Recommendations Precast prestressed hollow core floors

Content list (revised 2003-8-21)1. Scope of design2. Specific design principles3. Geometry4. Shear capacity on rigid and non rigid supports5. Flexural capacity6. Deflection7. Torsion8. Topping/composite action9. Punching10. Restrained supports11. Maximum point loads and line loads12. Transverse load distribution13. Dynamic actions

IPHA ANNUAL CONFERENCESeptember 2003

FIB Recommendations Precast prestressed hollow core floors

Content list (revised 2003-8-21)14. Vibrations and resonance15. Diaphragm action16. Horizontal loads17. Large openings18. Progressive collapse (will be deleted)19. Fire resistance20. Acoustic insulation21. Connections22. Fixings23. Tolerances24. Weepholes25. Transport and lifting26. Design considerations in connection with

manufacture IPHA ANNUAL CONFERENCESeptember 2003

FIB Recommendations Precast prestressed hollow core floors

Goal:

FIB recommendations will be published in 2005.

IPHA ANNUAL CONFERENCESeptember 2003

FIB Recommendations Precast prestressed hollow core floors

Three headlines- Hollow core element and element qualities- Quality design aspects- Calculation methods

IPHA ANNUAL CONFERENCESeptember 2003

FIB Recommendations Precast prestressed hollow core floors

Quality design aspects

Not only stress, load and span but also quality claims have to be considered, for example: - measures to minimize the difference incamber,

- detailing of camber- aesthetic of ceiling

IPHA ANNUAL CONFERENCESeptember 2003

FIB Recommendations Precast prestressed hollow core floors

Quality design aspectsFor a good quality of the ceiling: - Max. slenderness is 38- Level of prestressing is average

FIB Recommendations Precast prestressed hollow core floors

Quality design aspectsFor a good quality of the ceiling: - Max. slenderness is 38- Level of prestressing is average

For dwellings the max length of hollow core slabs are:

IPHA ANNUAL CONFERENCESeptember 2003

mm none 1200 mm 2400mm 3600mm200 7600 7400 6300 5200

Strength of element

Steel trimmer in house-buildingLength

FIB Recommendations Precast prestressed hollow core floors

Quality design aspectsFor a good quality of the ceiling: - Max. slenderness is 38- Level of prestressing is average

For offices in relation to the loads the max. length of hollow core slabs are:

IPHA ANNUAL CONFERENCESeptember 2003

Additional load*

5,00 KN/m² 6,50KN/m² 5,00 KN/m² 6,50 KN/m²

200 8000 7500 7500 7000260 11000 10000 9000 8000320 13000 12000 10500 9500400 15000 14000 11500 10500

*: Additional load = 1,50 KN/m² + live load

Strength of element

Industry and office buildingSprung ceilings Without sprung ceilings

FIB Recommendations Precast prestressed hollow core floors

Quality design aspectsFor a good quality of the ceiling For roofs: - Max. slenderness is 45- Level of prestressing is average

For roofs in offices in relation to the loads the max length of hollow core slabs are:

IPHA ANNUAL CONFERENCESeptember 2003

Sprung ceilings Without sprung ceilingsAdditional load* 2,00 KN/m² 2,0 KN/m²

150 8000 6500200 10000 9000260 12500 11500320 14500 14000400 18000 18000

*: Additional load = 1,00 KN/m² + live load

Strength of element Industry and office building

FIB Recommendations Precast prestressed hollow core floors

Quality design aspects:Good prediction of camber after erectionPre-stressing Camber (mm)Light 1,0/1000 x Element length ≤ 1/40 x Element heightMiddle 1,5/1000 x Element length ≤ 1/20 x Element heightHeavy 2,5/1000 x Element length ≤ 1/10 x Element height

IPHA ANNUAL CONFERENCESeptember 2003

Good prediction of camber during erection (A320)

0

5

10

15

20

25

30

35

5 7 9 11 13 15

span (m)

Cam

ber (

mm

)

light

middle

heavy

FIB Recommendations Precast prestressed hollow core floors

Quality design aspects

International directive of safety for- Erection of hollow core floors- Hoisting regulations

IPHA ANNUAL CONFERENCESeptember 2003

FIB Recommendations Precast prestressed hollow core floors

Hollow core floors must be:

a quality flooring solutionwith good design recommendations

IPHA ANNUAL CONFERENCESeptember 2003